Functional Description
The CY7C148 and CY7C149 are high-performance CMOS static RAMs organized as 1024 by 4 bits. Easy memory expansion is provided by an active LOW chip select (CS) input and three-state outputs. The CY7C148 remains in a low-power mode as long as the device remains unselected; i.e., (CS) is HIGH, thus reducing the average power requirements of the device. The chip select (CS) of the CY7C149 does not affect the power dissipation of the device.

FEATUREs
• Automatic power-down when deselected (7C148)
• CMOS for optimum speed/power
• 25-ns access time
• Low active power
   — 440 mW (commercial)
   — 605 mW (military)
• Low standby power (7C148)
   — 82.5 mW (25-ns version)
   — 55 mW (all others)
• 5-volt power supply ± 10% tolerance, both commercial and military
• TTL-compatible inputs and outputs